Spring Lazy initialization Configuration level

Cookies4Techies answered on June 16, 2022 Popularity 8/10 Helpfulness 2/10

answer Spring Lazy initialization Configuration level

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Spring Lazy initialization Configuration level

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@Lazy
@Configuration
@ComponentScan(basePackages = "com.baeldung.lazy")
public class AppConfig {

    @Bean
    public Region getRegion(){
        return new Region();
    }

    @Bean
    public Country getCountry(){
        return new Country();
    }
}

Popularity 8/10 Helpfulness 2/10 Language whatever

Source: www.baeldung.com

Tags: configuration lazy-initialization spring whatever

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Contributed on Jun 16 2022

Cookies4Techies

0 Answers Avg Quality 2/10

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// By default all beans are eagerly loaded (Beans are automatically initialized on the launch of application)
// Recommended : Use eager loading (Reason : Errors in spring configuration can be identified early if there is any)
// Use case : If there are too many beans that you need to stop loading early to speed up application launching process
// Use Scope : Annotation can be used anywhere you can use "@Bean" or "@Component" annotations

@Component
class ClassA {
	// Business Logic
}

@Component
@Lazy // THIS IS WHAT IS RESPONSIBLE FOR LAZY LOADING : will only load when any bean of this class is needed
class ClassB {
	
	@SuppressWarnings("unused")
	private ClassA classA;
	
	public ClassB(ClassA classA) {
		System.out.println("Some Initialization logic");
		this.classA = classA;
	}
	
	public void doSomething() { System.out.println("Do Something");}
}

@Configuration
@ComponentScan
public class LazyInitializationLauncherApplication {
	public static void main(String[] args) {
		try (var context = 
				new AnnotationConfigApplicationContext
					(LazyInitializationLauncherApplication.class)) {
			
			System.out.println("Initialization of context is completed"); // All eager loaded beans are created by this point
			context.getBean(ClassB.class).doSomething();  // Only now the lazy bean of ClassB will be loaded since it was called

		}
	}
}

Popularity 8/10 Helpfulness 4/10 Language java

Source: Grepper

Tags: lazy-initialization java spring lazy-initializa

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Contributed on Mar 23 2024

Innocent Iguana

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Spring Lazy initialization Configuration level

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